N.Y. Tax Law § 1350
* § 1350. Imposition of surcharge. In addition to any other tax or assessment imposed by this chapter or other law, there is hereby imposed, beginning on July first, two thousand twenty-six, a surcharge in accordance with this article on a covered property, or in the case of a covered property that is a residential cooperative property, a residential cooperative dwelling unit, that is not a primary residence, provided that (a) for fiscal years beginning on or after July first, two thousand twenty-six, and before July first, two thousand twenty-eight, the phase one market value of such covered property that is a class one property is equal to or greater than five million dollars, the phase one market value of such covered property that is a residential condominium dwelling unit is equal to or greater than one million dollars, or, in the case of a covered property that is a residential cooperative property, the phase one market value of a residential cooperative dwelling unit within such residential cooperative property is equal to or greater than one million dollars; and (b) for fiscal years beginning on or after July first, two thousand twenty-eight, the phase two market value of such covered property or, in the case of a covered property that is a residential cooperative property, such residential cooperative dwelling unit, is equal to or greater than five million dollars. * NB Repealed June 30, 2031